One vertex per element, one color per generator, with an edge from x to x·s.
(2,3)(13,14,19,22,18,21,26,28)(15,16,23,24,17,20,25,27)(1,2,4,3)(5,6)(7,10)(8,9)(11,12)(13,15)(14,20)(16,21)(17,18)(19,23)(22,27)(24,28)(25,26)(1,3,4,2)(6,9)(10,12)(13,16)(14,15)(17,21)(18,20)(19,27)(22,25)(23,28)(24,26)(5,7)(6,10)(8,11)(9,12)(13,17,18,15)(14,16,21,20)(19,25,26,23)(22,24,28,27)(7,11)(10,12)(14,21)(15,17)(22,28)(23,25) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.